Al-Pb, Mg-Pb or Mn-Pb binary cations doping in Bi-system high T_c superconductor

摘要

The effect of Mg-Pb, Al-Pb and Mn-Pb binary cations doping on the appearance time of high T_c 2223 phase in the Bi-system superconductor was investigated. We found that the binary cations dopants, Mg-Pb, Al-Pb or Mn-Pb tend to speed up the formation of high T_c phase distinctly and that the Al~(3+) Mn~(3+(4+)) and Mg~(2+) cations occupied certain positions in the crystal lattice of the high T_c phases. They play an important role in the formation of the high T_c phases and have an effect on the structure and the superconductivity of high T_c phases.